oracle经验记录

1、添加新User时必须要增加的角色权限：connect、dba、resource

2、添加表空间的语句 

create tablespace DEMOSPACE datafile 'D:/test.dbf' size 1500M autoextend on next 5M maxsize 3000M;

3、删除表空间

drop tablespace DEMOSPACE including contents and datafiles;

4、创建触发器实现自增

CREATE OR REPLACE TRIGGER sys_user_INS_TRG BEFORE INSERT ON sys_user FOR EACH ROW WHEN(NEW.ID IS NULL)  
BEGIN 
SELECT SYS_USER_ID.NEXTVAL INTO :NEW.ID FROM DUAL;